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Technician A is asked to make a 5 min measurement with a source 9the true count rate of long-lived radioactive source is 316 cpm) to determine the count rate and standard deviation. The measurement yields 1558 counts. Background is negligible.

What is the probability that technician B in an independent 5 minute measurement would obtain a value as close, or closer, to the true count rate as technician A.

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